Name
EXT_create_context_robustness
Name Strings
EGL_EXT_create_context_robustness
Contributors
Daniel Koch, TransGaming
Contributors to EGL_KHR_create_context
Contact
Greg Roth (groth 'at' nvidia.com)
Status
Complete.
Version
Version 3, 2011/10/31
Number
EGL Extension #37
Dependencies
Requires EGL 1.4
Written against the EGL 1.4 specification.
An OpenGL implementation supporting GL_ARB_robustness, an OpenGL ES
implementation supporting GL_EXT_robustness, or an implementation
supporting equivalent functionality is required.
Overview
This extension allows creating an OpenGL or OpenGL ES context
supporting robust buffer access behavior and a specified graphics
reset notification behavior.
New Procedures and Functions
None
New Tokens
Accepted as an attribute name in the <*attrib_list> argument to
eglCreateContext:
EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT 0x30BF
EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT 0x3138
Accepted as an attribute value for EGL_CONTEXT_RESET_NOTIFICATION_-
STRATEGY_EXT in the <*attrib_list> argument to eglCreateContext:
EGL_NO_RESET_NOTIFICATION_EXT 0x31BE
EGL_LOSE_CONTEXT_ON_RESET_EXT 0x31BF
Additions to the EGL 1.4 Specification
Replace section 3.7.1 "Creating Rendering Contexts" from the
fifth paragraph through the seventh paragraph:
<attrib_list> specifies a list of attributes for the context. The
list has the same structure as described for eglChooseConfig. If an
attribute is not specified in <attrib_list>, then the default value
specified below is used instead. <attrib_list> may be NULL or empty
(first attribute is EGL_NONE), in which case attributes assume their
default values as described below. Most attributes are only meaningful
for specific client APIs, and will generate an EGL_BAD_ATTRIBUTE
error when specified to create for another client API context.
Context Versions
----------------
EGL_CONTEXT_CLIENT_VERSION determines which version of an OpenGL ES
context to create. This attribute may only be specified when creating
an OpenGL ES context (e.g. when the current rendering API is
EGL_OPENGL_ES_API). An attribute value of 1 specifies creation of an
OpenGL ES 1.x context. An attribute value of 2 specifies creation of an
Open GL ES 2.x context. The default value for EGL_CONTEXT_CLIENT_VERSION
is 1.
Context Robust Access
-------------
EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT indicates whether <robust buffer
access> should be enabled for the OpenGL ES context. Robust buffer
access is defined in the GL_EXT_robustness extension specification,
and the resulting context must support GL_EXT_robustness and robust
buffer access as described therein. The default value of
EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT is EGL_FALSE.
Context Reset Notification
--------------------------
The attribute name EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_-
EXT specifies the <reset notification behavior> of the rendering
context. This attribute is only meaningful for OpenGL ES contexts,
and specifying it for other types of contexts will generate an
EGL_BAD_ATTRIBUTE error.
Reset notification behavior is defined in the GL_EXT_robustness
extension for OpenGL ES, and the resulting context must support
GL_EXT_robustness and the specified reset strategy. The attribute
value may be either EGL_NO_RESET_NOTIFICATION_EXT or EGL_LOSE_-
CONTEXT_ON_RESET_EXT, which respectively result in disabling
delivery of reset notifications or the loss of all context state
upon reset notification as described by the GL_EXT_robustness. The
default value for EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT
is EGL_NO_RESET_NOTIFICATION_EXT.
Add to the eglCreateContext context creation errors:
* If <config> does not support a client API context compatible
with the requested context flags and context reset notification
behavior (for client API types where these attributes are
supported), then an EGL_BAD_CONFIG error is generated.
* If the reset notification behavior of <share_context> and the
newly created context are different then an EGL_BAD_MATCH error is
generated.
Errors
EGL_BAD_CONFIG is generated if EGL_CONTEXT_OPENGL_ROBUST_ACCESS_-
EXT is set to EGL_TRUE and no GL context supporting the GL_EXT_-
robustness extension and robust access as described therein can be
created.
EGL_BAD_CONFIG is generated if no GL context supporting the
GL_EXT_robustness extension and the specified reset notification
behavior (the value of attribute EGL_CONTEXT_RESET_NOTIFICATION_-
STRATEGY_EXT) can be created.
BAD_MATCH is generated if the reset notification behavior of
<share_context> does not match the reset notification behavior of
the context being created.
New State
None
Conformance Tests
TBD
Sample Code
TBD
Issues
None
Revision History
Rev. Date Author Changes
---- ------------ --------- ----------------------------------------
3 31 Oct 2011 groth Reverted to attribute for robust access. Now it's a
companion to rather than subset of KHR_create_context
2 11 Oct 2011 groth Merged ANGLE and NV extensions.
1 15 July 2011 groth Initial version
